我有以下HTML：
<td width=140 style='width:105.0pt;padding:0cm 0cm 0cm 0cm'>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
mso-fareast-font-family:"Times New Roman";color:#666666'>OCCUPANCY
TAX:</span></p>
</td>
一些HTML属性没有被引用，例如：width=140和class=MsoNormal
有没有PHP函数可以处理这类事情，如果没有，在HTML中清除这类问题的聪明方法是什么？
谢谢。
我想你可以使用regexp来实现这一点：
/'s(['w]{1,}=)((?!")['w]{1,}(?!"))/g
's match any white space character ['r'n't'f ]
1st Capturing group (['w]{1,}=)
['w]{1,} match a single character present in the list below
Quantifier: {1,} Between 1 and unlimited times, as many times as possible, giving back as needed [greedy]
'w match any word character [a-zA-Z0-9_]
= matches the character = literally
2nd Capturing group ((?!")['w]{1,}(?!"))
(?!") Negative Lookahead - Assert that it is impossible to match the regex below
" matches the characters " literally
['w]{1,} match a single character present in the list below
Quantifier: {1,} Between 1 and unlimited times, as many times as possible, giving back as needed [greedy]
'w match any word character [a-zA-Z0-9_]
(?!") Negative Lookahead - Assert that it is impossible to match the regex below
" matches the characters " literally
g modifier: global. All matches (don't return on first match)
实现方式如下：
echo preg_replace_callback('/'s(['w]{1,}=)((?!")['w]{1,}(?!"))/', function($matches){
return ' '.$matches[1].'"'.$matches[2].'"';
}, $str);
并将导致：
<td width="140" style='width:105.0pt;padding:0cm 0cm 0cm 0cm'>
<p class="MsoNormal"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
mso-fareast-font-family:"Times New Roman";color:#666666'>OCCUPANCY
TAX:</span></p>
</td>
Eval.in实例
注意，这是一个肮脏的例子，肯定可以清理掉。